The book, like the first edition of The Fellowship of the Ring, is presented as if it is an actual translation from the Red Book of Westmarch, and contains some background information on the world of Middle-earth which is not found elsewhere. Examples are the name of the tower at Dol Amroth and the names of the Seven Rivers of Gondor. There is some dispute about its canonical status since the information presented about the secondary world is considered only as folklore among the Hobbits.

It is also notable because it uses the letter "K" instead of "C" for the /k/ sound in Sindarin, a spelling variant Tolkien alternated many times in his writings.